Our company sticks to the principle of "Quality is the life of the company, and reputation is the soul of it" for Frequency Meter, Switching Power Supply 30v 10a , Audio Frequency Sweep Signal Generator , Adjustable Variable Frequency Power Supply ,Linear Dc Power Supply 30v 5a . Now we have experienced manufacturing facilities with extra than 100 employees. So we could guarantee short lead time and high quality assurance. The product will supply to all over the world, such as Europe, America, Australia,Chile , Macedonia ,UK , Canada .We set a strict quality control system. We have return and exchange policy, and you can exchange within 7 days after receive the wigs if it is in new station and we service repairing free for our products. Please feel free to contact us for further information if you have any questions. We are glad to work for every client.